Fundamentalist Islam is re-surging on its war path to conquer the world until all submit to Islam after the US and Europe have pulled back from the Middle East, taking advantage of the lack of opposition to continue spreading a faith that (with the exception of Indonesia) was spread entirely by conquering people and either having them convert at threat of death or implementing Shariah law that gave them a hundred reasons to convert (lower taxes, greater inheritance share, right to own weapons for self defense, not facing regular humiliation by the magistrate).
The greatest good in the Koran is spreading Islam, more important than life of the believer or the victim.
Quran (8:12) - "I will cast terror into the hearts of those who disbelieve. Therefore strike off their heads and strike off every fingertip of them"
A command to strike terror with horrors to scare them into converting. This makes committing atrocities to scare others into converting moral.
Quran (8:57) - "If thou comest on them in the war, deal with them so as to strike fear in those who are behind them, that haply they may remember."
Commit horrible acts so that everyone is scared into submission - terrorism. It is also a reasonable tactic - commit something horrific, advertise it well, then they surrender and you don't have to waste lives invading and fighting in the streets.
Quran (17:16) - "And when We wish to destroy a town, We send Our commandment to the people of it who lead easy lives, but they transgress therein; thus the word proves true against it, so We destroy it with utter destruction."
If they won't convert when offered, Muslims have the obligation to kill and/or conquer them.
Quran (8:39) - "And fight with them until there is no more fitna (disorder, unbelief) and religion is all for Allah"
Fight until all the world submits to Islam. There are a hundred more verses like this, that command believers to fight to spread Islam - and we know it means war and not spiritual struggle because the lame and blind are exempt, which isn't relevant if you're struggling with your soul.